https://english.cas.cn/newsroom/mutimedia_news/202210/t20221027_322314.shtml

China has newly installed a stationary system that operate fully automatically on the seafloor, monitoring its own condition and performing smart management. Scientific researchers can also remotely control the station. The newly installed station is equipped with a MWh lithium battery energy system, which represents a new breakthrough in energy density. The energy system is capable of storing 1000 kWh of electricity and can continuously support the station’s subsea operations for more than six months.